Vermiculite overview

Crystallography


Type Occurrence of Vermiculite

Place Of Occurrence:Millbury, Worcester Co., Massachusetts, USA
Year Of Discovery:1824 (18th Century)
Occurrence:Forms as an alteration product of biotite or phlogopite, by weathering or hydrothermal action. Vermiculite is mined as a natural insulation material worldwide.

Crystallography of Vermiculite

Crystal System:Monoclinic
Cell Parameters:a = 5.24Å, b = 9.17Å, c = 28.6Å, β = 94.6°
Ratio:a:b:c = 0.571 : 1 : 3.119
Unit Cell Volume:V 1,369.83 ų (Calculated from Unit Cell)
Vermiculite for Crystallography
Radiation - Copper Kα ;Horizontal Axis: 5° to 90° ; Vertical Axis: 100%

Optical Data of Vermiculite

Type:Monoclinic
RI values:n α = 1.525 - 1.561 nβ = 1.545 - 1.581 nγ = 1.545 - 1.581
Maximum Birefringence:Δ = 0.020
Vermiculite for Crystallography
Chart shows birefringence interference colour range (at 30�m thickness) and does not take into account mineral colouration

Surface Relief:Low
Dispersion:Weak

Classification of Vermiculite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/H.21-10
Nickel-Strunz 10th (pending) edition ID:9.EC.50
 
9 : SILICATES (Germanates)
E : Phyllosilicates
C : Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets

Dana 8th edition ID:71.2.2d.3
 
71 : PHYLLOSILICATES Sheets of Six-Membered Rings
2 : Sheets of 6-membered rings with 2:1 layers

Hey's CIM Ref:16.19.22
 
16 : Silicates Containing Aluminum and other Metals
19 : Aluminosilicates of Fe and Mg

Relationship of Vermiculite to other Species

Structurally related to group(s):Montmorillonite-Vermiculite Group
Related Minerals - Nickel-Strunz Grouping):
9.EC.05 Minnesotaite (Fe,Mg)3(Si4O10)(OH)2
9.EC.05 Talc Mg3(Si4O10)(OH)2
9.EC.05 Willemseite (Ni,Mg)3(Si4O10)(OH)2
9.EC.05 Ferripyrophyllite Fe23+(Si4O10)(OH)2
9.EC.05 Pyrophyllite Al2(Si4O10)(OH)2
9.EC.05 Boromuscovite KAl2(BSi3O10)(OH)2
9.EC.05 Celadonite K(Mg,Fe2+)Fe3+(Si4O10)(OH)2
9.EC.05 Chernykhite (Ba,Na)(V3+,Al,Mg)2((Si,Al)4O10)(OH)2
9.EC.05 Montdorite (K,Na)2(Fe2+,Mn2+,Mg)5(Si4O10)2(OH,F)4
9.EC.05 Muscovite KAl2(AlSi3O10)(OH)2
9.EC.05 Nanpingite CsAl2(AlSi3O10)(OH,F)2
9.EC.05 Paragonite NaAl2(AlSi3O10)(OH)2
9.EC.05 Roscoelite K(V3+,Al)2(AlSi3O10)(OH)2
9.EC.05 Tobelite (NH4,K)Al2(AlSi3O10)(OH)2
9.EC.05 Aluminoceladonite K(Mg,Fe2+)Al(Si4O10)(OH)2
9.EC.05 Chromphyllite K(Cr,Al)2(AlSi3O10)(OH,F)2
9.EC.05 Ferro-aluminoceladonite K(Fe2+,Mg)(Al,Fe3+)(Si4O10)(OH)2
9.EC.05 Ferroceladonite K(Fe2+,Mg)(Fe3+,Al)(Si4O10)(OH)2
9.EC.05 Chromceladonite K(Mg,Fe2+)(Cr,Al)(Si4O10)(OH)2
9.EC.05 Tainiolite KLiMg2(Si4O10)F2
9.EC.05 Ganterite (Ba,Na,K)(Al,Mg)2(AlSi3O10)(OH)2
9.EC.20 Annite KFe32+(AlSi3O10)(OH)2
9.EC.20 Ephesite LiNaAl2(Al2Si2O10)(OH)2
9.EC.20 Hendricksite K(Zn,Mg,Mn2+)3(AlSi3O10)(OH)2
9.EC.20 Masutomilite (K,Rb)(Li,Mn3+,Al)3(AlSi3O10)(F,OH)2
9.EC.20 Norrishite KLiMn23+(Si4O10)O2
9.EC.20 Phlogopite KMg3(AlSi3O10)(OH,F)2
9.EC.20 Polylithionite KLi2Al(Si4O10)(F,OH)2
9.EC.20 Preiswerkite NaMg2Al(Al2Si2O10)(OH)2
9.EC.20 Siderophyllite KFe2+2Al(Al2Si2O10)(OH)2
9.EC.20 Tetraferriphlogopite KMg3(Fe3+Si3O10)(OH,F)2
9.EC.20 Fluorotetraferriphlogopite KMg3(Fe3+Si3O10)F2
9.EC.20 Wonesite (Na,K)(Mg,Fe,Al)6((Al,Si)4O10)2(OH,F)4
9.EC.20 Eastonite KMg2Al(Al2Si2O10)(OH)2
9.EC.20 Tetraferriannite KFe32+((Fe3+,Al)Si3O10)(OH)2
9.EC.20 Trilithionite K(Li,Al)3(AlSi3O10)(F,OH)2
9.EC.20 Fluorannite KFe32+(AlSi3O10)(F,OH)2
9.EC.20 Shirokshinite KNaMg2(Si4O10)F2
9.EC.20 Shirozulite K(Mn2+,Mg)3(AlSi3O10)(OH)2
9.EC.20 Sokolovaite CsLi2Al(Si4O10)F2
9.EC.20 Aspidolite NaMg3(AlSi3O10)(OH)2
9.EC.20 Fluorophlogopite KMg3(AlSi3O10)(F,OH)2
9.EC.20 UM2004-49-SiO:AlCsFHKLi (Cs,K)(Al,Li)2.6((Si,Al)4O10)(F,OH)2
9.EC.20 Suhailite (NH4)Fe32+(AlSi3O10)(OH)2
9.EC.20 Yangzhumingite KMg2.5(Si4O10)F2
9.EC.20 IMA2009-006 KLi2Ti(Si4O10)OF
9.EC.20 Oxyphlogopite K(Mg,Ti,Fe)3[(Si,Al)4O10](O,F)2
9.EC.25 Brammallite (Na,H3O)(Al,Mg,Fe)2((Si,Al)4O10)(OH)2
9.EC.30 Margarite CaAl2(Al2Si2O10)(OH)2
9.EC.35 Anandite (Ba,K)(Fe2+,Mg)3((Si,Al,Fe)4O10)(S,OH)2
9.EC.35 Bityite LiCaAl2(AlBeSi2O10)(OH)2
9.EC.35 Clintonite Ca(Mg,Al)3(A13SiO10)(OH)2
9.EC.35 Kinoshitalite (Ba,K)(Mg,Mn 2+,Al)3(Al2Si2O10)(OH)2
9.EC.35 Ferrokinoshitalite (Ba,K)(Fe2+,Mg)3(Al2Si2O10)(OH,F)2
9.EC.35 Oxykinoshitalite (Ba,K)(Mg,Ti,Fe 3+,Fe2+)3((Si,Al)4O10)(O,OH,F)2
9.EC.35 Fluorokinoshitalite BaMg3(Al2Si2O10)F2
9.EC.40 Beidellite (Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2. nH2O
9.EC.40 Kurumsakite (Zn,Ni,Cu)8Al8V25+Si5O35. 27H2O (?)
9.EC.40 Montmorillonite (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2. nH2O
9.EC.40 Nontronite Na0.3Fe2((Si,Al)4O10)(OH). nH2O
9.EC.40 Volkonskoite Ca0.3(Cr,Mg,Fe)2((Si,Al)4O10)(OH)2. 4H2O
9.EC.40 Yakhontovite (Ca,Na)0.5(Cu,Fe,Mg)2(Si4O10)(OH)2. 3H2O
9.EC.45 Hectorite Na0.3(Mg,Li)3(Si4O10)(F,OH)2
9.EC.45 Saponite Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2. nH2O
9.EC.45 Sauconite Na0.3Zn3((Si,Al)4O10)(OH)2. 4H2O
9.EC.45 Spadaite MgSiO2(OH)2. H2O (?)
9.EC.45 Stevensite (Ca,Na)xMg3-x(Si4O10)(OH)2
9.EC.45 Swinefordite Li(Al,Li,Mg)4((Si,Al)4O10)(OH,F)4. nH2O
9.EC.45 Zincsilite Zn3(Si4O 10)(OH)2. 4H2O
9.EC.45 Ferrosaponite Ca0.3(Fe 2+Mg,Fe3+)3((Si,Al)4O10)(OH)2. 4H2O
9.EC.55 Baileychlore (Zn,Fe,Al,Mg)6((Si,Al)4O10)(OH)8
9.EC.55 Chamosite (Fe2+,Mg)5Al(AlSi3O10)(OH)8
9.EC.55 Clinochlore (Mg,Fe2+)5Al(AlSi3O10)(OH)8
9.EC.55 Cookeite LiAl4(AlSi3O10)(OH)8
9.EC.55 Franklinfurnaceite Ca2Fe3+Mn32+Mn3+(Zn2Si2O10)(OH)8
9.EC.55 Gonyerite (Mn2+,Mg)5Fe3+(Fe3+Si3O10)(OH)8
9.EC.55 Nimite (Ni,Mg,Al)6((Si,Al)4O10)(OH)8
9.EC.55 Orthochamosite (Fe2+,Mg,Fe3+)5Al(AlSi3O10)(OH,O)8
9.EC.55 Pennantite Mn2+5Al(AlSi3O10)(OH)8
9.EC.55 Sudoite (Mg,Fe2+)2Al3(AlSi3O10)(OH)8
9.EC.55 Donbassite Al4.33(AlSi3O10)(OH)8
9.EC.55 Glagolevite Na(Mg,Al)6(AlSi3O10)(OH,O)8
9.EC.55 Borocookeite Li1+3xAl4-x(BSi3O10)(OH)8
9.EC.60 Aliettite Ca0.2Mg6((Si,Al)8O20)(OH)4. 4H2O
9.EC.60 Corrensite (Mg,Fe)9((Si,Al)8O20)(OH)10. nH2O
9.EC.60 Dozyite Mg7Al2(Al2Si4O15)(OH)12
9.EC.60 Hydrobiotite K(Mg,Fe2+)6((Si,Al)8O20)(OH)4. nH2O
9.EC.60 Karpinskite (Ni,Mg)2Si2O5(OH)2(?)
9.EC.60 Kulkeite Mg8Al(AlSi7O20)(OH)10
9.EC.60 Lunijianlaite Li0.7Al6.2(AlSi7lO20)(OH,O)10
9.EC.60 Rectorite (Na,Ca)A14((Si,Al)8O20)(OH)4. 2H2O
9.EC.60 Saliotite (Li,Na)Al3(AlSi3O10)(OH)5
9.EC.60 Tosudite Na0.5(Al,Mg)6((Si,Al)8O18)(OH)12. 5H2O
9.EC.60 Brinrobertsite Na0.3Al4(Si4O10)2(OH)4. 3.5 H2O
9.EC.65 Macaulayite (Fe,Al)24Si4O43(OH)2
9.EC.70 Burckhardtite Pb2(Fe3+,Mn3+)Te4+(AlSi3O10)O2(OH)2.H2O
9.EC.75 Ferrisurite (Pb,Ca)2.4Fe3+2(Si4O10)(CO3)1.7(OH)3. nH2O
9.EC.75 Surite (Pb,Ca)3(Al,Fe22+,Mg)((Si,Al)4O10)(CO3)2(OH)2
9.EC.75 Niksergievite (Ba,Ca)2Al3(AlSi3O10)(CO3)(OH)6. nH2O
9.EC.80 Kegelite Pb8Al4(Si8O20)(SO4)2(CO3)4(OH)8
Related Minerals - Hey's Index Grouping:
16.19.1 Indialite Mg2Al3(AlSi5O18)
16.19.2 Cordierite (Mg,Fe)2Al3(AlSi5O18)
16.19.3 Sekaninaite (Fe,Mg)2Al3(AlSi5O18)
16.19.4 Ferrogedrite Mg3(Si4O10)(OH)2
16.19.5 Staurolite (Fe2+,Mg,Mn)2Al4Si2O10(OH)4
16.19.6 Chloritoid Mg3(Si4O10)(OH)2

Other Names for Vermiculite

Synonyms:BrodrickiteCulsageeiteJefferisiteZonolite
Other Languages:
German Vermiculit
Russian Вермикулит
Simplified Chinese 蛭石
Spanish Vermiculita
Varieties:BataviteCopper VermiculiteEastonite (of Hamilton)Lucasite (of Chatard)

 

 

 
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